el_boufador
Which is exactly why uppy downy seatposts are good. You don't have to be arsed. It is very very easy and no faff whatsoever.
Its alot of money for a gimmick, don't get me wrong I can see the point in them but its what ever rubs your rhubarb.
grum
I have never minced my way down a hill banging my balls on my seat, its never caused me any bother and you have to admit they are bloody expensive. Disc brakes are great, suspension forks are great too you forgot to add in rear suspension which is immensely popular but not needed IMO.